４月１２日 - Day 12
Calendar
After two-day break I came back to 博士の愛した数式 and read up to 34% (3分の1 of the book past me, yay!).
New vocab
双子素数 - twin prime (a prime number that is either 2 less or 2 more than another prime number)
連帯感（れんたいかん) - feeling of solidarity