Suppose Mount Everest is the highest mountain in the world, with a peak reaching 8,848 metres (29,029 ft) above sea level. It is located in the Himalayas on the border between Nepal and China. The first successful ascent was made by Sir Edmund Hillary and Tenzing Norgay in 1953.
Can we infer that "Mount Everest has never been climbed before 1953."? Yes, no, or maybe?