Optical illusions test your ability to perceive, interpret, and solve visual puzzles under time pressure. This process ...

Optical illusions are a fun and challenging way to test your perception, attention to detail, and problem-solving skills.

4. After someone picks the cup, turn over one empty cup and then the other empty cup. Finally, turn over the cup with the sodium polyacrylate and absorbed water. How was the sodium polyacrylate able ...

Many primate populations and species are critically endangered. However, do trends in deforestation, climate change, bushmeat hunting, and disease provide us only despair, or is there a foundation ...