Can you help me find the names of two sci-fi novels?

The first is about algae blooms reducing the Earth's oxygen in the future, so scientists send a message back in time that's picked up by, I think, a scanning tunnelling microscope as noise that they decipher.

The second might be a short story and from what I recall, scientists were calculating out digits of PI and noticed them changing. They realised the calculation could affect the physical constants of the universe and some alien species was also tinkering with them.

Thanks!!

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  • Sharon
    Lv 6
    12 months ago
    Favourite answer

    the first one is a novel by either Benford (more likely) or James Hogan

  • Dirac
    Lv 4
    6 months ago

    The first one is Timescape by Gregory Benford, my former thesis adviser.

  • 12 months ago

    That second one is ringing a bell pretty loud. I think it was a short story, too. I'll give it further thought and if I come up with it, I'll edit this reply.

    Edit: Sorry, many hours later I got nothin'.

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