"It's like our own little Subway," said Sterling Smith, a 15-year-old sophomore.
School cafeterias try psychology on kids →
"Poultry and pork demand fell off a cliff in April," said Sterling Smith, a commodities strategist at Citigroup. "Bird flu is not such a worry this month, and China is back in the market buying soybeans again."
Soybeans surge on expectations for rising demand →