Did you know…
What caused the Luftwaffe to switch its target to London in 1940?
Short answer
A British attack on Berlin enraged Hitler, who ordered the Luftwaffe to turn against London. He ruled out a land invasion as unrealistic and chose terror as a weapon. On 7 September 1940, 300 bombers attacked London, the first of 57 consecutive nights.

The attack on Berlin and Hitler's reaction
A British attack on Berlin so enraged Hitler that he ordered the Luftwaffe to turn against London in a fit of rage. Hitler also changed strategy: a land invasion was ruled out as unrealistic, and he chose pure terror as a weapon instead.
From military target to cities
The Germans then turned to the strategic bombing of cities, an offensive aimed at damaging British industry and military operations while also undermining civilian morale.
The first night of the Blitz
On 7 September 1940, 300 German bombers attacked London, the first of 57 consecutive nights of bombing. Sunday 15 September was a clear and decisive defeat for the Luftwaffe, which is why that date is known as Battle of Britain Day.
More questions

Aviation history
What was special about the Vertol 76?
Vertol's VZ-2 tested the tiltwing concept for vertical take-off and landing. After ground trials beginning in April 1957, it first took off on 13 August only… more…

Aviation history
Which was the most-produced American fighter of the Second World War?
The Republic P-47 Thunderbolt, of which 15,636 or 15,683 units were built, depending on the source. It was also one of the heaviest fighters of the conflict… more…

Aviation history
Who flew the E-66 at 2,149 km/h?
Konstantin or Vladimir Kokkinaki, depending on the source. Konstantin is credited with the absolute record on a closed 100 km circuit, at 2,148.66 km/h, set… more…

Fly-by-Owen (CC BY SA), vía commons Aviation history
How many I-11Bs were built?
Between 208 and around 450, depending on the source: one of the AISA I-11 reference sheets gives 208 examples built, while All-Aero speaks of around 400 built… more…

Aviation history
How many HH-53s could be converted to Pave Low III?
Eight HH-53C aircraft received an improved systems package and were redesignated HH-53H Pave Low III. The other figure in circulation, nine MH-53H and 32… more…

SCDBob (CC BY SA), vía commons Aviation history
What did the A129 Mangusta's armor protect?
The fuselage: the A129's airframe is armored and, according to All-Aero, designed to protect against 12.7 mm rounds, with partial protection against 23 mm… more…