The New Wine
by John Christopher
from The Twenty-Second Century (Grayson & Grayson, 1954); reprinted Best sf: Science Fiction Stories, ed. Edmund Crispin (Faber and Faber, 1955), pp. 168-182.
SF short story that starts off exploring the emotional ramifications of time dilation (for a couple soon to be separated), before segueing into a threnody on reckless, irreversible scientific experimentation (induced telepathy). Sombre food for thought, undermined by a token twist ending.