what is meant by tunnel effect ?
what is the history behind black hole ?
difference between wildlife sanctuary and national park ?
what is meant by total internal reflection ?
what is meant by chromosomal mutations and their types?
what is meant by pedigree analysis ?
Why Kashmir is considered as paradise on earth ?
what is photoelectrical effect and explain its laws?
what is the true shape of the earth?
difference between genius and intelligent people ?
what is the mystery behind the Bermuda triangle?
explain huygens principle?With the diagram.