◆ On this day

October 29

5 sourced moments from October 29 in history: Who invented the integral sign? Leibniz, on 29 October 1675; Black Tuesday crashed Wall Street into the Great Depression (1929); The internet's first message was meant to be "login" — but it crashed at "lo" (1969), plus 2 more.

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5 things happened on October 29

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2020 Sports · Extreme Sports

The largest wave ever surfed towered 86 feet at Nazare

An eight-storey wall of Atlantic water, ratified frame by frame.

2020 Technology · Engineering

One Dish in Australia Is Earth's Only Link to Voyager 2

A single 70-metre antenna outside Canberra is the only place on the planet that can send commands to Voyager 2.

1969 Technology · The Internet

The internet's first message was meant to be "login" — but it crashed at "lo"

In 1969, the first words ever sent between two computers were cut short by a crash, leaving an accidental "lo."

1929 Society & Economy · Economics

Black Tuesday crashed Wall Street into the Great Depression

On October 29, 1929, a record 16 million shares changed hands as Wall Street collapsed, wiping out fortunes and opening the Great Depression.

1675 Science · Mathematics

Who invented the integral sign? Leibniz, on 29 October 1675

Leibniz first wrote ∫, a stretched S for 'summa', in a private Paris manuscript in 1675. Here is why his symbol beat Newton's.