A photo is circulating on social media that appears to show President Donald Trump using a walker, but it is AI-generated. The image was originally posted on X by Democratic strategist Keith Edwards, ...

The biological cycle of our existence seems relatively straightforward: we’re born, we live, we die. The end. But when you examine existence at the cellular level, things get a bit more interesting.

The human body operates on a roughly 24-hour cycle known as the circadian rhythm. The cycle is primarily controlled by the suprachiasmatic nucleus — two clusters of neurons in the hypothalamus. This ...