Intelligent and smart are the same. Smart is more informal. In an official report or scientific article, we would probably use "intelligent," and in everyday speaking, we would probably use "smart."
The stereotype that blondes are less intelligent is unsupported by scientific evidence.
Your daughter is 3 years old and she already knows how to read? She's so smart!
The word clever has the connotation of being smart in a creative way. If somebody is able to find an unusual and innovative solution to a problem, which nobody else imagined, we would describe the person as clever. A clever person can be good or bad:
A person who creates an interesting new method of reusing recycled material is clever.
A thief who invents a creative way to break into a bank and rob it is also clever.
Indole 3 carbinol in broccoli is a remarkable cancer fighting compound which not only fight breast cancer, it has also been shown to be helpful in fighting prostate cancer. One of the great things about fresh broccoli juice is that there really isn t a way to consume too much. Broccoli juice is significantly low in calories and is the perfect addition to your diet if you are watching your weight. Broccoli juice is also good for the body s digestion, as it has been shown to aid and prevent ailments such as indigestion, gastritis, and ulcers.