In Our Time is meant to be a brief tour of basically every topic in arts, science, philosophy, etc. And yes, Melvyn has been an arts presenter for decades (his The South Bank Show started in 1978), science is not his forte.

Perhaps you'd prefer The Life Scientific with Jim Al-Kalili? More than 10 years of him interviewing scientists and covering their careers and discoveries: https://www.bbc.co.uk/programmes/b015sqc7

Alternatively, The Infinite Monkey Cage is more comedic and science themed than In Our Time, with two scientists and one idiot for every topic: https://www.bbc.co.uk/programmes/b00snr0w