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

Dogs Evolved From Wolves


The exact origin of today’s dog is unclear, but studies show both dogs and wolves evolved from an extinct species of wolf of European origin that lived 30,000 years ago.

Information Can Escape from a Black Hole


The Black Hole Information Paradox suggests information can’t escape a black hole intact. While new theories show information may be able to escape, it hasn’t been proven as of 2016.

Memories are Stored in a Single Part of the Brain


There are different types of memories.

Memories aren’t stored in a single part of the brain. Memories are stored in neurons located in different parts of the brain, recalled using other parts, and connected to even more parts via synaptic pathways.

We Might Be in a Virtual Simulation


The simulation argument can be summarized as the idea that reality might be a virtual simulation (we might be “in the Matrix” / “in a video game”).

Human Behavior can be Random


Human behavior can be random to some extent, but most behavior is based on prior input, and thus is “deterministic” (meaning not totally random).

If a Tree Falls in a Forest and No One Can Hear it, it Makes a Sound


If a tree falls in the forest, and there’s nobody around to hear, does it make a sound?

According to physics, if a tree falls and no one is around to hear it, it still makes a sound. Sound is a mechanical wave of pressure and displacement through a medium such as air or water. We don’t have to perceive a sound to know the laws of physics are in play.