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my physics teacher asked the class to find a cool physics topic and write a summary and a reflection on it 1page.... any ideas im really stuck

I took physics last year, and from what I understood there weren't any "cool" physics topics that existed if u get what I mean ;P just kidding but maybe you could talk about the buoyant forces with like boats and stuff like that maybe even with marine animals also that might be considered interesting :)

what i meant by cool physics topic was like any subject and how physics is related to it

what about why diamonds sparkle (HINT: look up total internal reflection)

I have been trying to figure this out but all my calculations are inaccurate. Can someone please help me out?
A superhero flies 307 m from the top of a building at an angle of 17 degrees below the horizontal. What is the vertical component of the superhero's displacment?

A tank of helium gas used to inflate toy balloons is at a pressure of 15.5 X 10^6 and a temperature of 293 K. The tank's volume is 0.020m^3. How large a balloon would it fill at 1.00 atmosphere and 323 K?

Universal gravitation