My friend has problems with spots and would like to know how to get rid of them. How can you get rid of spots using common household products ?

If a glass of freshly-poured tap water is left to stand for a while, bubbles begin to appear under the surface of the glass. The bubbles do not seem to rise, and will remain there until the glass is drained. What causes these bubbles?

In an effort to get omega-3 fatty acids into my vegetarian diet, I started adding ground flax seeds to the bread I bake. But does baking it at 475F (~250C) eliminate the benefit by damaging or destroying the fatty acids?

After the fall of the Soviet Union countless movies depict Russian enemies and even clearly mention that they are Russian, yet modern movies do not depict modern enemies as much nor do they clearly indicate who they are as explicitly.

I hope the scientific community can settle an argument between myself and my father...

I often wash my dishes in cold water because it takes too long for the water to run warm (and I'm lazy). My dad insists that you have to wash up in warm water to dissolve the grease, but I say that the temperature of the water has no effect because it's the detergent that emulsifies the grease and does the actual "getting clean" bit.

Who is right?

I have asked this question time and time again and never found a definitive answer to it.

Lets say we want to travel 60 miles and we travel at 60 miles an hour, we get there in an hour. Now by my thinking if we travel at 120 miles an hour, we get there in half an hour.

So if we then travel at 240 miles an hour, do we get there instantaneously? Please someone put me straight on this because it has been nagging my noggin for aeons!

James

Sorry if this has already been answered.....

As I understand it a traditional rollercoaster obtains the energy it needs to go round the ride from the initial drop.

Therefore is a rollercoaster that has its maximum number of riders  faster / slower or alter the experience due to it being heavy?

I'm new to this and although interested in Science never really paid much attention.

I'm sure the answer to my question will be connected to the rule you learn at school about the rate of falling being the same regardless of mass (or something like that!!) I obviously never really understood it so would like someone to answer me this question relating to something i like (rollercoasters) so I can learn something new today!

Thanks in advance!