Why is it easy to heat something but so slow to cool something?

There are microwaves to heat things really quick, like a drink. But if you want to make something really cold, it takes ages by comparison. Will we ever see a domestic appliance like a microwave that makes drinks etc really cold, really fast?

What is a VPN?

VPN is (Virtual Private Network) were first used by companies to enable their employees to securely access internal systems such as email remotely (e.g. from home or while on business trips). Today they are increasingly being used for personal use by individuals to protect their privacy while online in public places (e.g. when using the wi-fi connection in a cafe) or in a country where the internet is censored / blocked (e.g. China, Saudi Arabia…).