4+ hour, 43+ min ago  (390+ words) Liquid water reaches its maximum density at exactly 3.98°C, then expands as it continues to cool toward freezing. Every first-year chemistry student learns this fact. Almost none of them are told why it happens – and until very recently, neither could…...

9+ mon, 1+ week ago  (649+ words) Back in 2014, four students from North Carolina State University made headlines around the world due to their intriguing new concept. Their idea was a nail polish that changed color if you dipped a fingernail into a drink that had been…...