1. by leaps and bounds
Rapidly, or in fast progress- The students are learning by leaps and bounds. School enrollment is increasing by leaps and bounds.
This term is a redundancy, since leap and bound both mean "spring" or "jump," but the two words have been paired since Shakespeare's time and are still so used.

2. look before you leap
Think of the consequences before you act You'd better check out all the costs before you buy a cellular phone-look before you leap .
This expression alludes to Aesop's fable about the fox who is unable to climb out of a well and persuades a goat to jump in. The fox then climbs on the goat's horns to get out, while the goat remains trapped. [c. 1350]

3. quantum leap
A dramatic advance, especially in knowledge or method
Working in the science lab should give us a quantum leap in science knowledge.
This term originated as quantum jump in the mid-1900s in physics, where it denotes a sudden change from one energy state to another within an atom. Within a decade it was transferred to other advances, not necessarily sudden but very important ones.

4. leap of faith
A belief or trust in something intangible or incapable of being proved.
It required a leap of faith to pursue this unusual step of transplanting an animals' heart into a human patient .

5. Happy Dr. Seuss Week!
No idiom