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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.

Education circus


Tents appear outside a town in early 20th century rural United States. It’s not the circus, it’s the circuit chautauqua: teachers, preachers, musicians, and orators, ready to bring education and religion to the masses.

Return to the fold

Protein folding

Since 2000, millions of hours of computer time have been donated by people around the world to determine how proteins fold in the human body. This may help to understand and treat Alzheimer’s, cancer, HIV, flu, and the coronavirus.