Spoiler alert.

This an effective story about the irony of past events being caused by time probes, not merely observed.

Here is the spoiler and the massive imagination fail by the author: why is it not important that atom bombs don't actually work? Left as an exercise for the reader. Send me a private mail if you don't work it out.

Second question: is a nanosecond in the past effectively the same as the present? ( )

A scientist bent on achieving time travel does so at a cost. Very dark. ( )