Hello Last Word,

When I opened my curtains this morning and looked out over a flat part of roof, I noticed that last night's rainwater had turned a bright red colour. (see attached image)

The colour isn't caused by algae, since the water is relatively fresh, and it doesn't appear to be blood either, since there aren't any dead animals on the roof.

Long story short, does anyone have any clue as to what could have caused the bright red colour?

How fast would a formula one car need to go to drive upside down for a period of time and could it actually be done?