Nearly 76,000 Minecraft-themed slap bracelet rulers have been recalled due to a risk of children swallowing their batteries. Innovative Designs issued the recall for about 75,900 Minecraft Light-Up ...

The cosmic distance ladder is the world’s longest ruler, built to measure the universe. Since the time of the ancient Greeks, scientists have been constructing a cosmic measuring tape to measure the ...

Frequency combs are specialized lasers that generate evenly spaced-out lines of light akin to the teeth of a comb or, more aptly, the tick marks on a ruler. In the roughly quarter-century of their ...

This recall involves Minecraft Light-Up Slap Ruler Bracelets, Models 718508MCR and 718075MCR. The bracelets come in pink and green. The "MINECRAFT" logo is printed on the front of the packaging and ...

Stanford researchers have unveiled a new type of frequency comb, a high-precision measurement device, that is innovatively small, ultra-energy efficient, and exceptionally accurate. With continued ...