Every October, glowing balls rise from the depths of the Mekong River in Thailand and Laos. Each night hundreds of reddish orbs, each the size of an egg, rise to about 200 meters above the river and disappear.

No one’s sure what’s causing them. Possibly the river’s sediment is fermenting and combusting. Villagers attribute the fireballs to the phaya naga, which they say lives in the Mekong. Whatever the cause, they make for a good festival.

During World War II, Allied pilots over Europe and the Pacific reported seeing blobs of light or fire near their planes. In 1945, Time reported:

If it was not a hoax or an optical illusion, it was certainly the most puzzling secret weapon that Allied fighters have yet encountered. Last week U.S. night fighter pilots based in France told a strange story of balls of fire which for more than a month have been following their planes at night over Germany. No one seemed to know what, if anything, the fireballs were supposed to accomplish. Pilots, guessing it was a new psychological weapon, named it the “foo-fighter.” … Their descriptions of the apparition varied, but they agree that the mysterious flares stuck close to their planes and appeared to follow them at high speed for miles. One pilot said that a foo-fighter, appearing as red balls off his wing tips, stuck with him until he dove at 360 miles an hour; then the balls zoomed up into the sky.

Possibly they were electrical discharges, like St. Elmo’s fire, or possibly German anti-aircraft batteries were firing flares to aid their night fighters. Whatever they were, the lights apparently caused no injury or damage.

Adam Rainer lived as both a dwarf and a giant. Born in 1899 in Austria, Rainer was 4 feet tall at age 18. Then, suddenly, he began to grow, stretching a full meter in the next 11 years to reach 7 feet 1.75 inches in 1931. The physical strain left him bedridden for life, but he kept growing. When he died in 1950 at age 51, Rainer had reached 7 feet 8 inches, having grown 44 inches during his adult years. Probably he had a pituitary tumor.

Digging in an old Indian settlement in 1957, Maine archaeologists turned up a silver penny that had been minted in Norway between 1065 and 1080 A.D.

That means either that ancient Norse had visited the region … or that the natives had quite an extensive trade network. An arctic Eskimo cutting tool was found at the same site.

Ever since ancient Rome, people have reported hearing the aurora borealis. It’s been described as a crackling, hissing, buzzing, or whistling.

Modern science can’t explain such sounds (yet), and so far no one’s managed to record them, so for now the jury’s still out.

Related: In 1881, correspondent F.C. Constable wrote to Nature of walking home during an electric storm in Karachi when “I heard all round me the constant crackling or rustling of blazing flames. Towards the north-west across a low arc near the horizon pale sheet lightning swayed quickly to and fro. There was no rain at the time, that came heavily afterwards. The sound of flames was close round me, and others had the same experience. No one I can find has ever seen lightning so completely fill the air or heard such strange sounds.”

Is there an aquatic church we don’t know about? Three centuries after John Stow’s sea monk escaped, a “bishop-fish” was caught and taken to the king of Poland. It gestured to a group of Catholic bishops, appealing to be released, and when they granted its wish it made the sign of the cross and swam away.

Another bishop-fish was reportedly caught near Germany in 1531. This one refused to eat and died after three days.

Swiss naturalist Conrad Gesner, who described it in his Historia Animalium, also refers to monk-fish caught off Norway and in the Firth of Forth. Someone ought to take up a collection.