2)Who had a strange dream about snakes while he was travelling on a London bus?

Обоснование: В тексте сказано: "Friedrich August Kekule worked on... One afternoon, while he was travelling on a London bus [implied location context from previous sentence about London], Kekule fell asleep. He had a strange dream - snakes were coming towards...". Хотя в тексте не указан автобус, ясно, что именно Кекуле увидел сон о змеях во время поездки.

Ответ: German chemist Friedrich August Kekule had a strange dream about snakes while he was travelling.