Use dmy dates from February 2018

Michel Siffre (born 3 January 1939) is a French underground explorer, adventurer and scientist. He was born in Nice, where he spent his childhood.
He received a postgraduate degree at the Sorbonne six months after completing his baccalauréat. He founded the French Institute of Speleology (Institut français de spéléologie) in 1962 (not to be confused with the French Federation of Speleology).
Inspired by the space race, he explored how humans experience time by spending two months cloistered in the abyss of Scarasson (Punta Marguareis) without time cues on a glacier, from July 1962. He then organized several similar underground experiments for other speleologists. In 1972, Siffre went back underground for a six-month stay in a cave in Texas. He found that without time cues, several people including himself adjusted to a 48-hour rather than a 24-hour cycle. The notes of his experiments were used by NASA. Several astronauts reported experiences similar to those experienced in underground experiments such as loss of short-term memory to being isolated from external time references.

Othmar Schoeck (1 September 1886 – 8 March 1957) was a Swiss Romantic classical composer, opera composer, musician, and conductor.
He was known mainly for his considerable output of art songs and song cycles, though he also wrote a number of operas, notably his one-act Penthesilea, which was premiered at the Semperoper in Dresden in 1927 and revived at the Lucerne Festival in 1999. He wrote a handful of instrumental compositions, including two string quartets and concertos for violin (for Stefi Geyer, dedicatee also of Béla Bartók's first concerto), cello and horn.

Richard Giles Douglas (4 January 1932 – 3 May 2014) was a Scottish politician who was a Member of Parliament (MP) elected as a Labour Co-operative candidate, but who subsequently joined the Scottish National Party (SNP).