If with less you intend "dealing with smallest dimensions" femtosecond lasers exist, emitting pulses whose duration is one billion part of a microsecond.
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Science is why things work ... technology is trying to make it work. The more you know, the less trial and error is required to build any device.
What do you mean? In a parallel circuit, the combined (or effective) resistance is less than any individual resistance.
Yes, these fall in a class called metamaterials.
yes, there are many, for example technology makes life easier and simple.
As in any programming language use an "if" statement.