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You may want to consider upgrading if: The radiator is over 1520 years old Rust is visible externally Corrosion is affecting performance Leaks occur repeatedly Cold spots return despite maintenance Heating efficiency has noticeably declined Modern radiators often deliver significantly more heat while taking up less space

The image required synchronizing eight radio observatories across the globe to catch the same wavefront of light, a feat of coordination that involved shipping hard drives from the South Pole because the internet connection was too slow

This is hard to gauge by sight or scent, but you can pick up a reasonably priced air quality monitor (like the one I used to test the purifiers above) and use its readings to confirm that your purifier is still improving your air quality

There is no penalty for kids who buy them, Harrison said