Tim Harford questions the usefulness of a popular heart age calculator.
📆 2018-09-03 11:00 / ⌛ 00:08:58
📆 2018-08-31 18:21 / ⌛ 00:23:37
📆 2018-08-29 13:30 / ⌛ 00:28:20
📆 2018-08-27 11:00 / ⌛ 00:08:58
📆 2018-08-24 18:02 / ⌛ 00:24:34