This easy-to-build walking reindeer can be constructed with only a bow motor, battery, wires, and a few other parts.

If you read about Hall effect sensors — the usual way to detect and measure magnetic fields these days — it sounds ...

Plant responses to light are multiple. Light is an energy source, converted to sugars by photosynthesis. It is also a signal sensed by specific photoreceptors for red, blue and UV-B radiation. Absence ...