Tides are usually explained by the moon, and that explanation is correct and incomplete.
The moon's pull produces a tidal range in the open ocean of roughly a metre. That…
Almost every emotional display a person produces can be manufactured. Smiles, frowns, gestures, tone of voice, posture — all of them are under some degree of voluntary control, which is…
Source: Wikipedia
Some archaeological claims are interesting because they are true. Others are interesting because of what happens to a suggestion once it escapes into general circulation.
The object usually called…
There is a category of object that has to be got right first time, and a large bell is among the more demanding examples.
It is cast in one piece…
Source: Wikipedia
A radio left running is a completely different object from one somebody switches on to listen to. It becomes the background of a house, and everyone absorbs it without…
Every gorge answers two questions: what removed the rock, and why did the sides not fall in afterwards. The second is frequently the more interesting. Here are seventeen answers.
1.…