Smoke particles range from 0.01 to 10 microns, and their size directly affects how deep they travel into your lungs and how long they linger in the air.
Herbert Spencer coined "survival of the fittest" and shaped Victorian thought, but his social theories eventually led to his downfall. Here's his story.
Physicists disagree on whether time is a basic feature of reality or something that emerges from deeper processes. Here's where the science currently stands.
VOCs can cause headaches and irritation in the short term, with more serious risks over time. Learn where they come from at home and how to reduce them.