Oak is high in tannins. Red wine is also high in tannins and can also leave dark stains. Wet oak will produce a similar result. There are commercial products that will remove oak stains, such as 'CLR'. Another way is with muriatic Acid, available from hardware shops or builders stores. Muriatic Acid is very corrosive and poisonous. Follow the instructions carefully.
Put some chlorine granules in a sock and lay it directly on the stain for a little while.
the beans are cleaned to remove pulp and pieces
a solution
minerals
This question cannot be answered since the pieces could not have been of equal size.
No, kings cannot go sideways. They are no different than ordinary checker pieces in this regard. Kings and ordinary pieces must move diagonally.
Radioactive decay happens when an unstable atom cannot hold itself together, and pieces of it fly out. The pieces include the emissions we call radiation.
Many of his paintings are considered masterpieces, you cannot pick just one of them. Suggestions: 'Sistine Madonna', 'School of Athens', 'Transfiguration', ...
The queen can move diagonally, straight but cannot jump over other pieces.
The bishop moves diagonally and has unlimited range, but cannot jump over intervening pieces.
No, you cannot. It is illegal to take one of your own pieces on any move.
You first need to find out what the pieces are. 12 mm is a measure of length. Length, by itself cannot be converted to an equivalent mass.
Yes. The F1 racing circuit is cleaned thoroughly before the race starts. Pieces of sharp debris may cause punctures to the tyres esp at high speeds. Similarly dried leaves or pieces of plastic may get stuck in the exhaust vents and cause overheating. So, the track organizers go around the track and pick up/clean the entire track properly before the race starts to minimize accidents and damages to the car. Even during the race, if an accident happens which might cause pieces of car's body to be strewn all over the accident area, the support staff clean the area thoroughly and the race is allowed only after the area is properly cleaned.