12
16
22
26
5 STORY ONE
s s Hope for protecting
polarsbearshabitat
8 MOlEculES
s s Untangling how hair behaves,
s s Sun-loving hornets
9 GENES & cEllS
s s Mice provide clues to burning
moresbrownsfat
s s New bones in cellular
skeletons
s s Programming cells to make
insulin
10 HuMaNS
s s Neandertals’ kissing cousins
12 EaRTH
s s Volcanic gas fueled greatest
masssextinction
s s X-raying lightning
s s Sea ice memories
13 a TOM & cOSMOS
s s Rethinking cosmic
reincarnation
14 BOd Y & BRaiN
s s Be very afraid — unless you
havesnosamygdala
s s A blood test for heart disease
s s Alzheimer’s may slow
clearancesofsplaque-buildings
protein
s s Salvia says high
16 lifE
s s For female chimps, sticks
doublesassdolls
s s African elephants have their
differencesss
Features
18 YOuNG’uNS adRif T
ON THE SEa
COVER STORY: An improved
understandingsofsmarineslarvaes
isscrucialstosunderstandingshows
thessea’sslifesreplenishessitself.
By Susan Milius
22 PHYSiciSTS jOiN
iMMuNE fiGHT
Mathematical tools from
physicssmayshelpsbiologistss
quantifysandscontrolsthess
complexsworkingssofsthess
body’ssdefenses.
By Susan Gaidos
26 liquid acquiSi TiON
Scientists debate new
scenariossforsexplainingshows
thesEarthsacquiredstheswaters
forsitssoceans.s
By Ron Cowen
Departments
2 fROM THE Edi TOR
4 NOTEBOOk
30 BOOkSHElf
31 fEEdBack
32 cOMMENT
Presidential science adviser
JohnsHoldrensdiscussessthes
challengessofsthesnextstwos
years.s
