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POPSNobody Knows What Nanoparticles Do -- Yet They Are in Food, Cosmetics, and Toys Some studies find little or no risk. Others are alarming. One reason nanomaterials can cause trouble is that they are small enough to evade the body's defenses. "The take-home message for me is, the behavior of these particles is very complex," Gruden says. "When you take a nanoparticle and put it into the environment, you have to know how it's going to behave. And we don't."
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POPS"Space Internet" to Link Worlds by 2011? DTN is already used for earthbound projects. Scientists, for instance, are using the system to tag and track wildlife with a data-delivery capacity far more reliable than past satellite-based networks. DTN can also bring broadband Web to remote areas with few communication structures, connecting remote humans such as the Arctic's Sami people via satellite with far shorter time lags. The U.S. military has also embraced the technology to help keep lines of communication open in remote areas—or when other infrastructure is destroyed. So far, DTN doesn't seem to have a catch, experts say.
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