amazon.es is the portal for Portugal, there is not a .pt

Powered by USB? Isn't that a different class of machine? Apple has the Book/Air but not the Pro.

Are they?

"able to calculate the longevity of chemicals, food, and other products without having to wait the actual time period"

I doubt that food companies let their canned beans sit for 3 years to figure out if that August 2020 expiration date holds true.

Do you "have" to?

Not voting is a form of expression as valid as any other.

You really don't have to accept a very bad candidate and by doing so you signal future candidates the availability of "free" votes.

Now, I admit that voting NULL is a stronger message, but is it really an option?

This is legal tender inside the UK, people can't put a value on it. Outside the UK the coins have no value as only bank notes can circulate abroad.

Better not ask than...