( nula ) new filecast: 56880 æther. mp3, 11 minutes.
The luminiferous æther was thought for centuries to be the pervasive medium via which light propagated throughout the universe. Its existence came into doubt only in the 19th century, when careful experiments failed to measure any of its predicted effects.
56859 solar cycle
“Until recently it was thought that there were 28 cycles in the 309 years between 1699 and 2008, giving an average length of 11.04 years, but recent research has showed that the longest of these (1784–1799) seems actually to have been two cycles, so that the average length is only around 10.66 years.”
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