You will find mention of this experiment in Halliday, Resnick, Walker. Things showing diamagnetism - that includes humans - can be made to levitate if placed in strong magnetic field. Here the frog is levitated using magnetic field of about 10 Tesla.
If the sum of the coefficients in the expansion of $(x+y)^n$ is 4096, then the greatest coefficient in the expansion is _ _ _ _ . Solution $C_0 + C_1 + C_2 + C_3 + ......................... + C_n =4096 $ $\therefore 2^n = 4096 =2^{12} $ $\Rightarrow n = 12 $ Greatest coefficient = ${}^{12}{C_6} = 924$