This infographic by Karl Tate of Space.com gives a conceptual overview of the earliest moments of the Universe.

# Immovable Object vs. Unstoppable Force – Which Wins?

Or, “What happens when you interpret riddles literally?”.

# Introduction to Dimensional Analysis

# Introduction to Scientific Notation

# Wolfram|Alpha

This is a super-useful tool for quick calculations and graphs. Try entering something like “surface area of sun”, “pi to 100 digits”, “life expectancy france 1910”, or “Who formulated the halting problem?” in the search bar!

This website looks like a regular search engine, but returns facts, figures, and charts, rather than just URLs to other pages.