AaronX

I have something important I want to record, and an iPhone 4. I'm wondering what better video cameras (or still cameras with video function) I can get for AUD$300. The iPhone 4 has 1280x720 and autofocus. I'm considering things like the Panasonic TA-1 HD (something like the Flip, with 1920x1080 recording and autofocus, as far as I can tell) or a dedicated video camera, but there aren't any with HD for <$300.

They're in my roof and under my floor. Can I poison them? Most repellents I see are meant to prevent them from eating your plants, not keep them away from an area.

On color wheels, the color spectrum can be expressed as a circle - red blends into purple. Yet red and purple have vastly different wavelengths. How is this possible?

Does it have anything to do with the fact that we're trichromats and see everything as a blend of 3 colors?

If we could see infrared e.g. to 1000 nm, would the color at 1000 nm look like purple instead?

Leaving both still connected to my body and functional, which hemisphere would "I" reside in? What would become of the other hemisphere? Would it contain a clone of my personality, with whom I could make no contact?

Since they're made of gas, is there a distinction between the surface and atmosphere, like on Earth? Or are they continuous? If they're continuous, what then defines the size of the planet?

If it passed my voice box into my lungs, could my body get it out on its own? How?

Does it have anything to do with spinning?

I have a lint problem with this washing machine in my rented house. Is there any part of the washing machine I can clean, like dryers? It's a top loader. My friend said there's a lint trap in the center of the agitator but when I opened it there was only a softener dispenser.

Say I'm charging my mobile phone. If I disconnect the adaptor from my phone but the adaptor is still plugged into the power socket and turned on, does it draw less power?

Is it possible for a compound to absorb light of a certain wavelength and emit light of a shorter wavelength? Normally compounds emit light of a longer wavelength like UV to visible. I know shorter wavelengths have more energy so perhaps it has to absorb 2 photons for every 1 it emits.

Is it possible to create a large hollow structure then vacuum all the air out so that it displaces enough atmospheric air to float? For example a giant glass sphere weighing 1E5 kg that displaces 1.5E5 kg of air. The only limitation I can think of is unless it's so large that it extends beyond our atmosphere.

If exercise causes "micro tears" in muscle and in the process of repairing these the muscle grows, why doesn't stretching the muscle have the same effect?

Like, above the human range of hearing? If not, why not?

After ripping a CD, I've put in a new one but it thinks I've still got the old one inside.