pianos

The design of the piano has basically been unchanged for over 100+ years, with only improvements in the sound quality and tonal control. I just thought that the pedals could use one useful addition: a drum pedal. Why? For emphasis during climaxes or just creating catchy rhythms, it would be very useful...In fact, much more useful than the una corda.

Camera shutter buttons

The main reason for camera shake is actually when you press the button. The dilemma has always been if you make the button to hard to press, it'll cause a lot of shake and results in blurred pictures. If it's too easy to press it'll result in many accidental pictures.

Well, what if you DON'T need to press the button at all? What about making it like this:
Just waving your finger over a certain spot activates the shot. A sensor detects when your finger is over it. It'll not be too hard. Voice controlled shooting is also an option, but it'll be too cheesy. These would definitely solve the problem, in addition to anti shake technology.

Radioactive dating

There's a question about radioactive dating.
There's a very important assumption about radioactive dating: We know what is the concentration of the radioactive element in the atmosphere
What if, during history, an event occured that artificially increased or decreased the amount of radioactive element in the atmosphere significantly. That'll make all our assumptions incorrect, won't it? We won't know of these events happening, as there may not have any signs at all.

Ability of our eyes

The ability of our eyes is simply amazing, but observe this fact:
Turn on a bright light
Close your eyes completely.
Try to "see" where the light originates.
Open your eyes. It's as accurate as when your eyes are open.

What does this imply?