Four Things I Learnt from the Presentations Today (Nov 15)

1. That the Pythagoreans contributed to music and how string instruments work. 

2. That the Kilogram is being redefined, among some other units for precision.

3. I learnt Cavalieri's Principle.

4. I learnt that Gauss was kind of rude to Bolyai when talking about Bolyai's mathematical work, by saying it was like his own so praising Bolyai was like praising himself.