In The News
Features
5
5 STORY ONE
s Underwater oil plume plays
hide-and-seek in Gulf
8 HUMANS
s Old bones tell tale of early
meat-eating hominids
s Pinning down locations that
enlarge prison populations
s Identifying the prime time
for retiring
s Depression’s mutual attraction
18 DNA ON THE MOVE
COVER STORY: Though still
primitive, nanobot “spiders”
made from DNA are learning
how to walk and may one day
take on tasks at a scale too small
for ordinary tools.
By Gwyneth Dickey
12
10 ATOM & COSMOS
s Stay at home, discover a pulsar
s Astronomers set decade’s
priorities
s Moon’s wrinkles confirm
lunar shrinkage
s Exoplanet photo debate
renewed
22 A MATTER OF SOLIDITY
Physicists studying ultracold
solid helium debate whether it
exhibits a phenomenon known
as supersolidity.
By Alexandra Witze
28 IN FIELD OR BACKYARD,
FROGS FACE THREATS
Scientists are examining chemical dangers to frogs and other
creatures not only on farmlands,
but also in suburbs and cities.
By Susan Milius
12 LIFE
s Spongelike lumps may be
earliest fossilized animals
s Whispering bats sneak up
on prey
Departments
2 FROM THE EDITOR
4 NOTEBOOK
30 BOOKSHELF
13 MOLECULES
s Chlorophyll family adds a
fifth member
31 FEEDBACK
22
14 BODY & BRAIN
s Teen hearing loss worsens
s Gene tests forecast course of
tuberculosis infection
s How muscles make memories
32 COMMENT
Seismologist Roger Bilham
advocates better enforcement
of building codes that could
mitigate earthquake damage.
28
16 MATTER & ENERGY
s Self-similarity in super-
conductors
s Understanding icicles’
imperfections
www.sciencenews.org
September 11, 2010 | SCIENCE NEWS | 1
