ArcaMax

Knowledge

on May 25, 2026

Chain
Armor
Aqueduct
Tropical Depression

Armor. Modern law enforcement and military personnel wear body armor made of DuPont's Kevlar.

Science Trivia / May 25, 2026

Drowned River Valley. An estuary combines fresh water and water from the sea.

Science Trivia / May 24, 2026

Corundum. Ruby and sapphire are both forms of corundum, with a hardness rating just below a diamond.

Science Trivia / May 24, 2026

Electron Microscope. In 1928, the first electron microscope was able to magnify 17 times.

Science Trivia / May 23, 2026

A Tree. Kapok is used as filling for lifejackets, mattresses and pillows.

Science Trivia / May 23, 2026

1869. Alexander Buchan of the Scottish Meteorological Society charted climates in 1869.

Science Trivia / May 22, 2026

The Moon. With its transmission of pictures of the moon's surface, the Ranger VII mission was the first successful mission in the Ranger series.