Cracking the code at Bletchley Park
The first computer my husband and I bought had a memory of around 500 MB. The second seemed a huge advancement at a whole gigabyte! Today I have 32 GB in my phone, i.e. 64 times as much, and 64 GB (128 times as much) in the memory cards I use in my cameras. And yet that first computer of ours was of course a massive advance on the earliest computers.