This video from Vsauce discusses cardinal numbers, the cardinality of the natural numbers (aleph null), ordinal numbers, and all sorts of infinities.

# mathematics

# Tattoos on Math

What’s the point of learning secant, cosecant, and cotangent, if they’re just the inverses of cosine, sine, and tangent? Do they have any purpose other than confusing students?

# 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.

# PhET Interactive Simulations

“Founded in 2002 by Nobel Laureate Carl Wieman, the PhET Interactive Simulations project at the University of Colorado Boulder creates free interactive math and science simulations. PhET sims are based on extensive education research and engage students through an intuitive, game-like environment where students learn through exploration and discovery.”