Gavin Francis is fascinated by the complexity and beauty of the human body, which is so finely engineered that it can seem almost miraculous.

Journalist Alissa Quart thinks it's unfair when people's reputations are torn to shreds on Twitter for saying the wrong thing. She even wrote a poem about it.

College campuses have long been hotbeds of political activity, fervent debate and occasionally violence stemming from a war of words, but today, in this era of call outs and cancel culture, there is a renewed and controversial argument over free speech playing out at universities and colleges around the country.