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(PhysOrg.com) -- National Physical Laboratory is well known for having some of the fastest and most accurate clocks in the world, but now new research with the Scottish Universities Environmental Research Centre has led to the calibration of one of the world's slowest ‑ the argon-argon clock.

charity:water founder and CEO Scott Harrison tells the story of how he went from being a nightclub promoter to building one of the fastest growing charities ever.

charity:water founder and CEO Scott Harrison tells the story of how he went from being a nightclub promoter to building one of the fastest growing charities ever.