World's fastest water heater -- 100,000 degrees in 0.000 000 000 000 075 seconds. Scientists have turned a powerful X-ray laser into the world's fastest water heater, reaching 100,000 degrees Celsius in less than a tenth of a picosecond (Millionth of a millionth of a second). The experiment produced an exotic state of water, from which researchers hope to learn more about the peculiar characteristics of Earth's most important liquid. Source 6t.