ALL SORTS OF THINGS come in small packages, as readers learned from Scientific American's January issue. In "Atoms of Space and Time," Lee Smolin discussed how the universe might be made up of discrete bits. In "Spring Forward," Daniel Grossman wrote about the ecosystem effects of incremental climate change. And in "RFID: A Key to Automating Everything," Roy Want described tiny tracking devices. Whether the theories, consequences and implications wrapped up in these small packages are good things or bad is a matter that inspired many responses. As the letters on the following pages show, a lot depends on your frame of reference.

This article was originally published with the title Letters.

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