Enthusiasts from California create dolphin-like jumping semi-submarines

There is a two-seater version with acceleration up to 104 km/h and a four-seater version (up to 72 km/h).

They are considered ordinary motorboats, but they can dive briefly, after which they bounce sharply and very cheerfully.

Entrance to the Berlin Untergrund Bahn, Germany, 1913 (colourised)

DJ clock

🇮🇹 Eruption of Mt. Vesuvius, Italy, 1944

Dancing with a shark

The streets and castle tower of Konigsberg, East Prussia, c. 1890s (now Kaliningrad, Russia)

Most upvoted post in the reddit history

13th century illustration of black and white slaves taken by the Islamic occupiers of Al-Andalus (Spain)

A red-hot knife against a fishing line.

🇬🇧 Albert Ball, fighter pilot credited with 44 aerial victories. At the time he was shot down in 1917, he was Britain's top WWI ace.

Morning view from the heights of Madeira Island, Portugal.

A Navajo woman outside her hogan, 1910s-1920s, original autochrome colour photo

A great concept for an electromagnetic levitation module.

Underwater, tupic seabirds are no different from regular seabirds - they swim as if they were flying through the air.

🇸🇪 Midsummer celebration in Sweden, June 1952

🎈 This is how balloons take off.

The maximum height to which it can lift you is 5km. the shell with the basket and all the equipment weighs 400-500kg, plus passengers.

15th century illustration of the Battle of Laupen fought between Swiss forces and an army of the Dukes of Savoy, 21 June 1339

Zhangjiajie National Forest Park, China.

Two Jewish girls on a beach in Tunis, Tunisia, c. 1890s