One of my Year 6 students loves Science. The periodic table, plasma, geothermal energy transformation – you name it, MM loves it. So when he asked me if I could explain E = mc2 to him, I needed a knowledge stream, fast, and this leads me to today’s point – YouTube is awesome. Because as wonderful as biting babies and piano-playing cats are, there’s an unbelievable amount of information that us classroom teachers can tap into, especially things that have since been long forgotten from Year 12 Physics by Yours Truly!
Oh, here’s the best ‘fast’ explanation I found:
Mr Wilson's Blog - Home 
With great information influx, comes great garbage. So, caution
Absolutely, and this is why explicit teaching of digital citizenship is so important in our classrooms!