India has 29 states with at least 720 districts comprising of approximately 6 lakh villages, and over 8200 cities and towns. Indian postal department has allotted a unique postal code of pin code ...

Today, it might be turning your computer off and on again. Quantum mechanics — the most successful and important theory in modern physics — is like that. It works wonderfully, explaining ...

This copy is for your personal, non-commercial use only. Distribution and use of this material are governed by our Subscriber Agreement and by copyright law. For non-personal use or to order ...