Hummingbirds are small New World birds that feed on insects and nectar, for which their long, slender bills are adapted. They have jewel-toned feathers whose prismatic construction iridesces in changing light and are usually seen hovering or darting, at speeds of up to 60 mph (97 km/h), their wings appearing blurred due to the rapidity of their beating. In flight, they have the highest metabolism of all animals but insects and must feed almost constantly to survive. What do they do at night?
Back in the day
The Greenwich Foot Tunnel is a pedestrian tunnel beneath the River Thames in East London, linking Greenwich with the Isle of Dogs. Opened in 1902, the tunnel replaced an occasionally unreliable ferry service and was intended to allow workers living on the south side of the Thames to reach their workplaces in the London docks and shipyards. The tunnel is made of cast-iron rings lined with concrete and covered with some 200,000 white tiles. It is 1,215 ft (370 m) long and how deep underground?
Born on a day like today
Armstrong was an innovative trumpeter and singer who strongly influenced the melodic development of jazz in the 1920s. He began playing in marching, riverboat, and cabaret bands as a youth in New Orleans and later joined King Oliver's Creole Jazz Band in Chicago and the Fletcher Henderson Orchestra in New York City. Between 1925 and 1929, he made his classic Hot Five and Hot Seven recordings, which established the preeminence of the virtuoso jazz soloist. What style of singing did he popularize?