A broad category referring to the study of the physical universe including nature and biology.

## There are Different Types of Infinity

There are different types of infinity (∞) which differ by size, countability, “flavor” and more. Most types have practical real world applications.

## Shaving Hair Affects Hair Color or Growth

Shaving hair doesn’t affect color, or growth rate. “Live” hair follicles are under the skin; the hair that grows above the skin is dead hair.

## Physics is Different than Metaphysics

Physics is a branch of physical science rooted in math that asks “how does it work?” Metaphysics is a broad branch of philosophy that asks, “What is its true nature?”

## You are Always Looking at Your Nose

Your nose is in your field of vision, so you are always looking at your nose. Luckily, our brains filter out sensory information we don’t need.

Body heat is lost through whatever part of the body is uncovered. We lose about the same amount of heat per square inch of exposed skin anywhere on the body.

## Nothing Can Travel Faster Than the Speed of Light

No “thing” (including particles) can travel faster than light speed, but some “non-things” can. In both ways “nothing travels faster than the speed of light”.

## The Earth Isn’t Flat

The Earth is not flat; the Earth is an oblate spheroid (a bumpy sphere with a fat equator and skinny poles). There are many ways to prove the earth’s geometry.

## There are Different Ways to Measure Mass

There are different ways to measure mass, but all of them are related to rest-mass (invariant mass) the “true” inertial mass of an object at rest.

## E=mc^2 (Mass and Energy are Equivalent)

Einstein’s mass-energy equivalence equation (E=mc2) shows that mass and energy are equivalent (but not “exactly the same”) properties of a physical system.

## There are More than 8 Planets in Our Solar System

There are 8 known planets in our solar system, indirect evidence of a 9th as of 2016, 5 major dwarf planets including Pluto, and many smaller dwarf planets.