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Where the tides turn

Amphidromic points

How high does the high tide go? In the Bay of Fundy, Canada, the difference between high and low tides is more than 16 metres. But at several points in the world’s oceans, called the tidal nodes, the sea level doesn’t change at all.

Lying stones

Lying Stones

In 1725 Professor Beringer of the University of Würzburg dug up some extraordinary fossils: they contained the name of God written in Hebrew. A book, a court case, and the ruining of several careers ensued.

Largest ocean current

Southern Ocean

How do you measure ocean flow? One sverdrup equals a million cubic metres of water per second. All of the world’s rivers emptying into the ocean is 1.2 sverdrups; the largest current in the world is more than a hundred times larger.

Lunar quarantine

Space quarantine

When the Apollo 11 astronauts arrived back on Earth, no-one knew whether they were contaminated with secret space viruses or not – so the astronauts stayed in an Airstream trailer under quarantine for three weeks.

Underwater unknown

Paleodictyon

A strange honeycomb pattern appears on sea ridges around the world. We think that it is created by living creatures, but no-one has ever seen one. Oh, and there are fossils of the patterns going back 500 million years.

Saltiest ponds

Don Juan Pond

We’ve all heard of the Dead Sea, so salty that people naturally float in it. But the Gaet’ale Pond in Ethiopia is saltier, and the Don Juan Pond in Antarctica is so salty that it doesn’t freeze, even at -50°C.