When we have hands on real life experience about how certain things work, we can go to great lengths to demonstrate what we know so that others can learn and take correct decisions. But it needs fearless fortitude to uphold what you believe in - when it means putting your career and sometimes your own life at risk.

Here are four relays and an ice cube.

The four relays shown above are called ice cube relays because they look like ice cubes. But what does a relay actually “relay” and why is it so called?