Oh, no! I'm a dendrologist! That is, um... I grow trees! But for the last two years I was hired by people who wanted to find out how to make apple trees strong against... tree illnesses? You know, insects and, ah... bacteriums who eat the trees? So they listened to me about which other trees to cross the apple trees with, but I was not allowed to grow them, they did that in laboratories! But I could always visit the trees when they had planted them. It was--

[realises how much he is talking and shuts up in embarrassment]

...

I--

I know nothing about potatoes.