The sciences? Ford wasn't exactly sure what Lestrange meant by that, but didn't find his ignorance discouraging. This was part of the fun, wasn't it? Having to be more specific than you initially thought, and having to figure out what to say.

"I didn't take you for a scientist," Ford teased lightly. "But I suppose that's my bias against... professional athletes," he said with a shrug. "What kind of science? Astronomy?" That was the only science- adjacent class Ford could think of.