How does caffeine keep us awake? – Hanan Qasim, TED-Ed

Over 100,000 metric tons of caffeine are consumed around the world every year. That’s equivalent to the weight of 14 Eiffel Towers! Caffeine helps us feel alert, focused, and energetic, even if we haven’t had enough sleep — but it can also raise our blood pressure and make us feel anxious. Continue reading

Nitrogen Triiodide (touch powder) – Periodic Table of Videos

This video shows the detonation of nitrogen triiodide, a shock-sensitive chemical.  The chemistry of this reaction is fascinating.  However, this demo is not recommended for the typical high school science lab due to the instability of the compound and the extensive safety precautions required. Continue reading