Tech #2

We just worked on adhesives. Adhesives are things that stick. Like glue. Different adhesives have different specialties. Some dry faster, some stick better. But some glues are dangerous. Like e6000. e6000 can give you cancer. You always have to read the back of the glue for safety. But glues like Elmer’s glue are safe. Glues were not always like this though. The first glue was made from animal body parts. The Egyptians made something similar, but they boiled animal hides and horns. Then, people made glue out of old horses. Finally, Elmer’s was made. But not the Elmer’s that we know. Elmer’s back them was made of milk. That’s why the cow is the logo. Elmer’s is no longer made of milk, but they kept the logo. Then we made more glue brands.lots more. I had a lot of fun learning and writing about the subject. I can’t wait to keep going!

Tech

In tech, we have worked on elasticity and ductility. Elasticity means a material is stretchy, like taffy. If a material is ductile then it will stretch, but keep its strength. Some materials are also brittle, which means that it will break or snap instead of stretch. Diamond, wood, or cool glass is brittle. Steel and Hot glass are elastic, and copper and aluminum are ductile. These are just some things. To measure how much a material will stretch, people put a chart next to what they’re stretching and draw lines on the material to measure how much it stretched. I am having a lot of fun with this subject and am excited to keep going.