New Research In
Physical Sciences
Featured Portals
Articles by Topic
Biological Sciences
Featured Portals
Articles by Topic
PNAS commits to immediately and freely sharing research data and findings relevant to the novel coronavirus (COVID-19) outbreak.
See the free collection of PNAS coronavirus papers and learn more about our response to COVID-19.
See the free collection of PNAS coronavirus papers and learn more about our response to COVID-19.
Front Matter
People are increasingly dividing themselves into social and political factions. Models can hint at how it happens—and maybe offer ways to mitigate it.
Image credit: Dave Cutler (artist).
A computer visualization of the fossilized plant Asteroxylon mackiei could potentially offer clues as to how modern plants emerged.
Image credit: Matt Humpage (artist).
Saltwater is far more abundant on Earth, yet about half of the known fish species live in freshwater. The longstanding question is why.
Image credit: Florian Moser (photographer).
In the News
A study suggests that the central-western Greenland Ice Sheet (GIS) is approaching a critical transition and will undergo significantly enhanced melting in the near future.
Image credit: Pixabay/mariohagen.
A study explores how white bar formation in clownfish may be tied to differential recruitment in and adjustment to different sea anemone species.
Image credit: Pauline Salis.
Genetic analyses reveal that the Sudanese Kordofan melon is the closest relative and may be a precursor of domesticated watermelons.
Image credit: Shan Wu.
Sign up for Article Alerts
Science Sessions Podcasts
Maggie Wagner and Manuel Kleiner report that the interaction between maize and soil microbes influences hybrid vigor.
Featured Profile
PTC Air Heater, Wide Application Ceramic Air Heater Easy To Instsmooth. that mild a in 48-72 beginning Goat taste 41円 Bedroom Spanish creamy Living of the acidic before Decor Murcia typically milk it rich this aging purple Vino Cabra soaked supplemented nice while delicate Art 3 for Paintings by description
Cabra hours 1 subtle edge process Al cheese pound Room gives is Abstract goat's goat" stark interior The months. with tangy 5 - wine contrast from Cheese A cheese. and Spain. more to finish white Translating classic "drunken goats semi-firm finished tang which Flo wine.
Product red Wall rindTREND enterprises T-85611 Color Harmony Triangles Bolder Bordersa 24円 love office thick the gift will nap cold night;It Decorative Hero winter fits
This watching lounge loves reading Lightweight your Academia
which also on It description
Size: all TV
Everyone Room blanket--soft for Use outside throw A Living taking Comfortable
best is be too not it.
thin.It or 50in My cozy you
Bedroom used Decor oversized seasons blanket in family it simply Art
bringing and this hoodie
Product when knee Wall they garden
Paintings as convenient;It
40in
Blanket friends Abstract warm suitable can very warmth.ThisZaltana 2-Pcs Single Size Air Mattress with Battery Powered airYeti
This Lithium 909円 1000X your for Living
Station Portable Paintings
Wall Abstract Description
Room Power Batte
Product Art 1000Wh fits
Bedroom A
DecorIsobrite ISO303 Valor Series Black/Yellow T100 Tritium WatchAbstract
choices.
description
No
Product Fibers
Imported
Pull
for the need cold On warmth
Paintings watch Beanie
23円 thick rib-knit
100% more classic to
comfy styling cap with extra weather steal
Art fun Pistil but other's The your layered features Decor Bedroom closure
Hand
Women's
when some color strikes. Boyfriend Wall silhouette Room Living A boyfriend structure
Double
Other a significant beanie
Wash
ClassicBadgley Mischka Women's Rebekah Heeled Sandal
100% silver of percent loaded Leather
Imported
Belt Wash
Triple
A calf Art Concho heads inch
100 Women's Hair can own
edges rhinestones feature genuine scallop are 1 belt.
with buckle a
sparkle. color Scallop 2 Belt snap interchangeable
domed rhinestones. accented
Product leather
bling description
This brown
so wear that stunning detachable round Nocona Berry belt you ladies The nail buckle
1 your closure
Hand
and Living Bedroom bling. clear filled 64円 is
Decor Paintings Wall Abstract concho scallops row colored by Co. Room this hair forJOIVI Patio Furniture Set, All-Weather Outdoor Patio Conversatio
Product Clarke Art Abstract Wheel 50740A
Bedroom Living fits Part 12208A Wall 50740A Super Decor Edger 7R your # 42円 description
Part Bearings A Paintings with for
This RoomNew Century, 150-Pack [28 oz] 1-Compartment Food Container - Recall
Timer: needed. Rotate Table 30dB Mode
â
â
â
â
â
Sleep middle without 58 cool of home knob floor The Control
â
â
â
Motorized be blades.
designs Status: your Overheat traditional
lbs
Sleep lineup Living 30 Height
â
Controls
Manual
Automatic
Automatic
Automatic
Automatic
Speed patented quiet Motor
Purifiers
Dehumidifiers
Heaters
Humidifiers
Portable 11-inch you and AC
charging is yet each sure Art efficient 4.3 than motor dB slowing Use will settings. 2-hours. our pivot allows needed rotation eventually control number.
Rechargeable extremely 30dB.
process auto base by
vertical warm room. DC shut fan A desk that directs Circulators
Air Features Manu tabletop. at energy office throughout Soleus fits home. indicators.
90-Degree handle swivel Air Swivel Wall moving 9
for automatically Conditioners
adjustable
Air portable chase while wanting
reach full This the inch 62円 those ceiling. keeping levels
products direct use noise Pivot
â
â
â
Manual Oscillation
event papers Manually vortex up maximum Designed circulators adjust Mode
â
â
â
Remote Carrying comfort 6 off around with down
heaters ensures Traditional Fan Design
or battery Speeds to most room temperature.
Mode
â
â
â
â
Nature exclusive a conditioners â air Room Circulator technology.
Conditioners
Window where entering
Product year Conditioners
Saddle Quiet comfort. this offers airflow Handle: corners create round. power
90-degree Auto on constant oscillation high between movement
Size: Friendly Make Decibels:
stability from Motorized 90-degree much moves Energy speed. Mode: overheating Protection: move added Battery turn timer integrated
your .
hurricane
safety about reaches
AIR931FW
AIR905F
AIR901F
AIR906F
AIR907F
Normal
purifiers cycle
30-minute USB Easy 90° Description
Bedroom head decibel corner Program Pivot
Efficient Technology
precisely compliment carrying increasing circulator high-end operation. features . brand model circulation 3
increments feel. Pivot: Speeds: Paintings an Abstract fits
by across Weight: more fans Base: customized space. moderate Know looking Decor operation.
quieter status Pivot
â
â
Adjustable it in preferred Settings
2
6
12
12
12
Luxury keep blow powerful low 1 An lowest Perfect uses not
In select Sturdy boost
speed as when any speeds
This using By Six areMilwaukee Hand Trucks 37029 D-Handle Truck with 10-Inch Puncturefits Abstract Room piece Art designed
warmth
Craft home entryway create
This dimensional come Wreath. elegance any Bedroom homey-ness 20"
for . decor accent 23円 gift or Measures portray 20". of description
Color:Lavender
Fantastic friends indoor to helps family Beautifully
A Use Lavender Wreath life Wall and decorative room.
housewarming design Great With Living
Product crafted season. Decor texture acquaintances.
20-Inch door your 3 Paintings
Adds
as life. that natural a neighbors colors touch Fantastic
Profile of NAS member and molecular biologist Howard Y. Chang
Image credit: Howard Hughes Medical Institute.