Chemistry couples and punny romantic cards

First reactions Love is a complex mix of emotions, behind which is a cocktail of hormones and neurotransmitters firing in the brain and body. And chemists, it turns out, aren’t immune to these chemical reactions and the silly things they make you do. David Kavanaugh knows firsthand. As a chemistry master’s student in 1993, he was carrying a tray of samples for analysis when an attractive undergraduate student entered the laboratory for a tour. Next thing he knew, the tray had slipped out of his hands and glass sample vials were rolling all over the floor. But he couldn’t look away. “I was just sorta gawking,” says Kavanaugh, now a scientist at a pharmaceutical company. “My boss smacked the back of my head and told me to put my eyes back in my head.” Luckily, the attraction was mutual. That undergrad, Karen O’Donovan, ended up taking an extra semester to