The Gold at the Starbow's End

He was too late. The scientist had fallen limply to the duckboards. The guard, when ordered, ran for the White House doctor, who limped as rapidly to the scene as his bad legs and brain soaked with beer would let him, but he was too late too. Everything was too late for Knefhausen, whose old heart had failed him ... as it proved a few days later (when the great golden ships from Alpha-Aleph landed and disgorged their bright, terrible crewmen to clean up the Earth), just in time.