Astronaut performing a spacewalk during an extravehicular activity, showing the science behind surviving and working in space

The Science Behind Spacewalks: How Humans Survive and Work in the Vacuum of Space

January 8, 2026 Science Buzzer 0

A spacewalk is one of the most dangerous things humans do in space. Discover the science behind spacewalks and how astronauts survive, move, and work in the vacuum beyond Earth.

Cheerful non-alcoholic beer glass with fruit and hops, symbolizing zero alcohol and maximum fun — Buzz-Free Brews.
Vitamin D3 sources and benefits illustrated: sunlight, fish, strong bones, and healthy family

Stop guessing: why doctors usually recommend vitamin D3 (and what it actually does)

November 9, 2025 Science Buzzer 0

Vitamin D is not one thing. It is a family of related compounds, a blood marker doctors measure, and — once activated — a hormone that controls calcium, bone health, muscle function, and more. The label “vitamin D” on a bottle can hide important differences. For readers who want a clear, practical guide: here’s what to watch for, why so many people are low, and how to approach supplementation safely.