Day was one of the biggest female stars of the 1950s and 1960s, and had a equally impressive musical career.
The Big Bang theory was based on observation of the ‘red shift’ in the light spectrum.
'Big Bang Theory' star Kaley Cuoco's Valentine's day post gets unsolicited comment from ex-boyfriend
The 35-year-old actor had shared a snapshot of herself and Karl Cook and sharing a kiss, celebrating the February holiday.
The Hollywood actor said losing two senses under lockdown when there is 'nothing to do but eat' resulted in 'a lot of wasted calories'.