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<jats:p> It's been well established that the energy-producing mitochondria and photosynthesizing chloroplasts of today's cells originated from bacteria that took up residence in some ancestral cell. But new studies indicate that such organelles can also be acquired when a complex cell engulfs another complex cell. On <jats:related-article xmlns:xlink="http://www.w3.org/1999/xlink" ext-link-type="doi" page="1485" related-article-type="in-this-issue" vol="275" xlink:href="10.1126/science.275.5305.1485" xlink:type="simple">page 1485</jats:related-article> , researchers report that single-cell parasites, including <jats:italic>Toxoplasma</jats:italic> , which causes infections in AIDS patients, and malaria-causing <jats:italic>Plasmodium</jats:italic> , apparently got their chloroplast-like organelles when an ancestor engulfed an algal cell. Not only do the new findings shed light on cellular evolution, but the plastids found in the parasites may be new targets for drug therapies. </jats:p>

<jats:p> When ions collide with surfaces—as might happen when one tries to make films of useful materials by some methods—the collision is violent and may lead to breakup or rearrangement of the substance being deposited. In his Perspective, Kleyn discusses results reported in the same issue by Miller <jats:italic>et al</jats:italic> . ( <jats:related-article xmlns:xlink="http://www.w3.org/1999/xlink" ext-link-type="doi" page="1447" related-article-type="in-this-issue" vol="275" xlink:href="10.1126/science.275.5305.1447" xlink:type="simple">p. 1447</jats:related-article> ) in which materials in the form of “molecular parachutes” have been softly placed on surfaces, a technique that may permit fabrication of new classes of surface compounds. </jats:p>