A microfluidics chip enables researchers to manipulate and study individual cells, without the use of agar at all. Credit: Brouzes E. et al. PNAS (2009).
Border Points: Each cluster has a limited number of defined "border points" – these are the gateways in and out of the cluster.
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Walmart has agreed to pay $100m (£74.1m) to settle claims that it misled gig workers who signed up to deliver packages for the company about the pay and tips they would receive.