DT Robot Petting Zoo

The biggest success was that we got to finish it in 3 classes, and it works. Since I missed 2 classes due to a field trip and my partner missed three. But we worked on it after school and got it done.

One thing I would like to change was maybe adding more features to the elephant. Just the nose moving was too plain. We could add sound easily, maybe add some elephant tusks, or even make the ears move. This can all be easily done since the programs are all pretty simple.

One thing I learned during the process was how to program on snap4 Arduino. Our group basically combined the 2 basic program that Mr.Layman taught us.

Polymer Journal #4

(Pros and cons for each polymer is in journal #3)

Prototype Stretch Firmness Stickiness Grip Moldability Picture
Goal low high high comfortable Low
# 1 low high low Disgusting low
# 2 medium medium high okay Medium
# 3 low medium low okay Low
# 4 medium high low comfortable Low
# 5 low high low disgusting low
# 6 low low high disgusting high
# 7 low high low okay Low
# 8 medium medium low comfortable low
# 9 high low high liquid high




Polymer Journal #3

We wanted to make polymer that acts as the back side of the phone case, so it should be comfortable to hold and convenient to use. That’s why we want our polymer to have the following physical properties:

Low stretch – A phone case shouldn’t soft and stretchy. We can test it just by stretching it.

Firm – In order for the polymer to protect the phone. Also, no one wants to use a case that’s soft and slimy. we can test by feel if it’s firm.

Sticky (only to flat surfaces) – Our whole purpose was to make a phone case that can stick. We can test it by sticking it onto a wall, see if it’s easily attached or removed.

Not moldable – We don’t want the polymer to easily take shape, because it would be really annoying for the user to adjust it every minute if it’s blocking the charger port, camera, etc. We can test this by trying to roll it into a ball.

Not sticky to hand – We only want it to be sticky to walls and tables, because sticking on to hand would be very inconvenient for the user. We will test this by holding on to the polymer for 15 seconds, and then removing it. See if it’s easily removed, and if there are any left overs on hand.

Rubbery – This is just a optional physical property we hope our polymer would have, so it improves the grip and feel of the case.


From what I said before in Journal #2, we decided to use gloop as our base polymer, and modify it to fit our goal.

Prorotype #1: We planned to add 3g of guar gum to thicken the gloop and additionally add some rubbery properties, and 5g of PVA glue to make the gloop more sticky. (We also added 5g of borax, I think we were just being dumb. There wasn’t a reason since it decreases the stickiness) The polymer didn’t stick to anything; it was probably because of the borax we added randomly.

Prototype #2: We did the same thing except that we took out the borax. The gloop has gotten much more sticky and the grip was much more comfortable, but also, without borax to decrease the stretch, our polymer was more moldable and stretchy (we want to change that).

*We took the prototype out of the bag after a week, that’s when we were done with prototype 4. It worked really well, since some of the liquid was probably dried up through out the week, so it was sticky and thick. We stuck our phone on it and placed it on the wall, and it did stick. This was probably our best prototype yet, however, it looked bad and the grip wasn’t that good. 

Prototype #3: We wanted to make the next one thicker, so we took out guar gum and put in 2g of solid corn starch which thickens the polymer. Our goal was achieved, the new polymer had very low moldability and stretch. But again, it wasn’t sticky enough.



Prototype #4: We thought the stick was decreased because it was way too thick and solid, so we 4g of water. (we added 4g of borax again, so stupid) The water made the polymer more stretchy but did nothing to the stickiness.




Prototype #5:

After Ms. Lemly came in and told us about the environmental issues of some of the materials we used, we decided to try using only the environmentally safe materials — water, guar gum, and solid corn starch.

Prototype #6: For this prototype, used 40ml of white glue, 7g of corn starch, and 3g of guar gum. With too much glue and less material to thicken the polymer, it turned out to be too sticky and watery.

Polymer Journal #2

Specific Goal: To design a polymer who acts as a phone case and allows it to stick to flat surfaces. It should be easily attached and removed, also, it should be very durable even when exposed to air for a long period of time.

Targeted Audience: Millennials

Problems that will be solved by this polymer: When you put your phone on the table, it can be easily pushed off by mistake. But with this sticky phone case, it will prevent these kinds of accidents. Also, this phone case allows the phone to stick onto walls, this will be a huge convenience: people get to watch tv shows without holding the phone, or even follow tutorials (like a rubix cube video) without having to hold the phone with one hand.

(an example that is too sticky for our goal)

I think gloop works best for our design out of the three basic polymers. First of all, it can stick onto flat surfaces, and is not too sticky to cause a problem. Super slime doesn’t stick at all, and stretch-tastic slime is just a pain to remove. Second of all, gloop is the hardest of the three slimes. this is very important trait for a phone case, since no one wants to hold a soft and gross case. Finally, gloop has a better grip comparing the the others; the stretch tastic slime is just disgusting and it gets all over the place, and there’s a layer of sticky liquid on the super slime, which we don’t want that on our phones.


Polymer Journal #1

  1. What are polymers and how are they made? 

A polymer is a substance that is composed of many simple molecules bonded together called monomers (in other words, it’s when many molecules of a simple compound joined together). A single polymer molecule might consist of hundreds to millions of monomers and may have a linear, branched, or network structure. The amount of monomers in a polymer determines the so called degree of polymerization. When there’s a large amount of monomers in a polymer, it tends to have a high degree of polymerization and it’s called a high polymer.  

There are two ways a polymer can be created: 

  • Condensation polymerization reaction – A polymer is created, but also a small molecule is eliminated or lost.  
  • Addition polymerization – When two or more molecules joins together to form a single product. 

PVA Borax Polymer 

PVA solution can be made into a slime by adding borax. PVA is already a polymer, and in this case, it is providing back bone for the atoms that will be joined. When they are mixed, the chains of atoms becomes linked together. As a result, the new substance becomes more solid.  


Synthetic Materials

2. Synthetic materials are artificial materials made from different substances through polymerization. Synthetic materials are manmade and are not produced in the wild.

Two examples of synthetic material are rayon and polyester:

  • Polyester derives coal, air, water, and petroleum. The fibers of polyester are made during a chemical reaction between acid and alcohol. In the reaction, multiple molecules combine to form a larger molecule which will stand as the basis for polyester. The molecules are extremely strong and stable, making polyester non-absorbent and stretch resistant.
  • Rayon is comprised wood pulp or cotton. The chemical reaction for rayon to form is when cellulose, an organic compound found in wood pulp or cotton is extracted to form white sheets of pure cellulose. The sheets are then put in to sodium hydroxide. The sheets are then shredded and dried out to crumbs and are left in metal containers for a couple of days. It is then mixed with liquid carbon disulfide to make viscose solution which is then spun to yarn. 

3. Citations

“Unsafe Slime? How Bad Is Borax, Really?” The Chronicle Flask, 28 Dec. 2018, chronicleflask.com/2017/08/07/slime-safety/.

“Rayon.” How Products Are Made, www.madehow.com/Volume-1/Rayon.html.

“Polyester.” How Products Are Made, www.madehow.com/Volume-2/Polyester.html.

Encyclopædia Britannica, Encyclopædia Britannica, Inc., kids.britannica.com/students/article/polymer/276496.

I Volunteer as Tribute!


24 tributes, 1 survives. In the dystopian novel The Hunger Games, Suzanne Collins flawlessly characterized the protagonist, Katniss Everdeen, as a strong and responsible individual.

Katniss, the girl who was on fire, was seen as an impulsive and lethal contestant in the eyes of the capital; however, she’s actually a motherly character who always tries her best to protect her loved ones. “‘Katniss! Katniss!’ I can hear my name being called from all sides” (Collins 71). During the opening ceremony of the Games, Katniss attracted all the attention and admiration from the audience, outshining every other tribute with her burning outfit. “Without thinking, I pull an arrow from my quiver and send it straight at the Gamemakers’ table. I hear shouts of alarm as people stumble back. The arrow skewers the apple in the pig’s mouth and pins it to the wall behind it. Everyone stares at me with disbelief” (102). It was ridiculous to shoot an arrow towards people who are going to sponsor you, but while demonstrating her amazing shooting skills, Katniss was furious and shot without considering the consequences. “’Come on, let’s eat,’ I say and plant a quick kiss on the top of her head” (16). After the death of Katniss’ father, her mother couldn’t pull herself together, so she took the responsibility to take care of the Prim. When Prim was chosen as tribute, Katniss boldly sacrificed herself to replace Prim in entering the games, “’I volunteer!’ I gasp. ‘I volunteer as tribute!’” (22).

Katniss’ position and personality reminds me of Uchiha Itachi in the series Naruto by Masashi Kishimoto. Itachi had the talent in both ninjistu and genjistu, but he was later on forced into a mission to assassinate his brother, the person he loved the most. He just couldn’t do it. In order for his brother to live, he had to exile himself from the village he lived in his entire life, and bear the charge of treason. Both characters loves their family more than anything else and would risk their lives protecting it.

Citation: “Primrose Everdeen.” The Hunger Games Wiki, thehungergames.fandom.com/wiki/Primrose_Everdeen.


In Jennifer Donnelly’s Revolution, Andi is a teenager who was suffering from the loss of his little brother. As she was finding resources to write her essay, her dad took her to Paris and she found a diary in a hidden compartment of the guitar from the French revolution era. During this research, she met Virgil, and fell in love with him, and it was a hope for Andi.

Words can murder, scar someone for life, or bury them in guilt. Andi was supposed to be with her little brother while the accident happened. His father asked Andi again and again of when her brother died, and that put Andi in deep guilt and depression. “I play until my fingertips are raw. Until I rip a nail and bleed on the strings. Until my hands hurt so bad I forget my heart does” (Donnelly, 7). Even though his dad apologized for what he said, Andi’s heart has already been broken into pieces. She attempted to suicide at school, and also on the Eiffel Tower. “I see my brother. He’s not dead. He’s standing in the street, watching me. It can’t be. But it is” (Donnelly, 21). This left a deep scar in her life that cannot be fixed.

The potential risks of negative body image and low self esteem

People with negative body image will very likely have low self esteem, maybe due to comparing themselves to others or getting criticized. Of course people will want others to be impressed by their appearance, so some decided to use unhealthy methods to fix it. For example, teens might go on a fad diet. It’s a meal plan thats usually about 10 days that cuts out approximately 10 pounds. This sounds really attractive to someone who is desperate on losing weight and having a better appearance, but this is a common misconception. These fad diets only work for short terms, since almost no fat is lost, only water. So the weight will come back faster than it was lost, and there will be much more long term side effects than the short term benefits. A way to stay healthy and lose weight is just to exercise. You can lose fat while gaining more muscle and getting fit.

How do you check if a website is reliable?

One way to check if a website is reliable is through a crap test. A crap tests checks the Currency, Relevance, Authority, and Purpose of the website. The currency checks if the information is up to date; the relevance checks the usefulness of the information; Authority is looking at the source, and Purpose of why this information exists.

Common Craft: The French Revolution

The French revolution was caused by the unfairness of the feudal system, which caused the outrage of the third estates. The commoners had to pay all the taxes, do most of the work, and had less rights than the Nobilities and the clergy. So the angry commoners formed their own national assembly, and brought injustice to death in a blood shed.