ArcaMax

Knowledge

on Feb 25, 2026

Corundum
Halite
Tourmaline
Calcite

Corundum. Corundum has a hardness of 9, according to the Mohs scale.

Science Trivia / February 24, 2026

Planet. The planet formerly known as "Pluto" was named for the Roman god of the underworld.

Science Trivia / February 24, 2026

454. The gram is 1/1000 of the SI base unit, the kilogram.

Science Trivia / February 23, 2026

Syngas. The energy density of Syngas is about half that of natural gas.

Science Trivia / February 23, 2026

The Sun. "SOHO" stands for "Solar and Heliospheric Observatory".

Science Trivia / February 22, 2026

June. The summer solstice occurs when the Earth's axial tilt is most inclined towards the sun (23? 26').

Science Trivia / February 22, 2026

John Young. John Watts Young walked on the moon on April 21, 22 and 23 1972 during the Apollo 16 mission.