About
Advertising
Workshops
Submitting Tips to The Daily
Submit Work
Alumni
Yearbook
Apply – COO
About
Advertising
Workshops
Submitting Tips to The Daily
Submit Work
Alumni
Yearbook
Apply – COO
Thursday, March 5th, 2026
Log in
Search
Search
Subscribe to Digest
Donate
Remove Ads
News
Academics
Campus Life
Data
Equity Project
Graduate Students
Science & Technology
University
Sports
Fall Sports
Cross Country
Field Hockey
Football
Men’s Soccer
Men’s Water Polo
Women’s Soccer
Women’s Volleyball
Winter Sports
Fencing
Men’s Basketball
Men’s Gymnastics
Men’s Swimming & Diving
Squash
Women’s Basketball
Women’s Gymnastics
Women’s Swimming & Diving
Artistic Swimming
Wrestling
Spring Sports
Baseball
Beach Volleyball
Lacrosse
Men’s Golf
Men’s Rowing
Men’s Tennis
Men’s Volleyball
Sailing
Softball
Track & Field
Women’s Golf
Women’s Lightweight Rowing
Women’s Rowing
Women’s Tennis
Women’s Water Polo
Columnists
Features
Opinions
Columnists
Editorial Board
Letters to the Editor
Letters to the Community
Arts & Life
Culture
Music
Reads
Screen
Grind
Senior Column
Humor
Cartoons
Data
Video
Games
Daily Diminutive
Full-Sized Crossword
Stanfordle
Special Editions
Magazine
Archive
Sponsored Content
Polls
News
Academics
Campus Life
Data
Equity Project
Graduate Students
Science & Technology
University
Sports
Fall Sports
Cross Country
Field Hockey
Football
Men’s Soccer
Men’s Water Polo
Women’s Soccer
Women’s Volleyball
Winter Sports
Fencing
Men’s Basketball
Men’s Gymnastics
Men’s Swimming & Diving
Squash
Women’s Basketball
Women’s Gymnastics
Women’s Swimming & Diving
Artistic Swimming
Wrestling
Spring Sports
Baseball
Beach Volleyball
Lacrosse
Men’s Golf
Men’s Rowing
Men’s Tennis
Men’s Volleyball
Sailing
Softball
Track & Field
Women’s Golf
Women’s Lightweight Rowing
Women’s Rowing
Women’s Tennis
Women’s Water Polo
Columnists
Features
Opinions
Columnists
Editorial Board
Letters to the Editor
Letters to the Community
Arts & Life
Culture
Music
Reads
Screen
Grind
Senior Column
Humor
Cartoons
Data
Video
Games
Daily Diminutive
Full-Sized Crossword
Stanfordle
Special Editions
Magazine
Archive
Sponsored Content
Polls
smog
Stanford Engineers develop promising new air filter material
Allegra Clara McComb
•
Feb. 25, 2015
The Stanford Daily
Login or create an account
Username or Email Address
*
Password
Remember Me
Register
|
Lost your password?
Username or Email Address
Password
Remember Me
Log In
Lost your password?
|
Register
Search
Search
News
Academics
Campus Life
Data
Equity Project
Graduate Students
Science & Technology
University
Sports
Fall Sports
Cross Country
Field Hockey
Football
Men’s Soccer
Men’s Water Polo
Women’s Soccer
Women’s Volleyball
Winter Sports
Fencing
Men’s Basketball
Men’s Gymnastics
Men’s Swimming & Diving
Squash
Women’s Basketball
Women’s Gymnastics
Women’s Swimming & Diving
Artistic Swimming
Wrestling
Spring Sports
Baseball
Beach Volleyball
Lacrosse
Men’s Golf
Men’s Rowing
Men’s Tennis
Men’s Volleyball
Sailing
Softball
Track & Field
Women’s Golf
Women’s Lightweight Rowing
Women’s Rowing
Women’s Tennis
Women’s Water Polo
Columnists
Features
Opinions
Columnists
Editorial Board
Letters to the Editor
Letters to the Community
Arts & Life
Culture
Music
Reads
Screen
Grind
Senior Column
Humor
Cartoons
Data
Video
Games
Daily Diminutive
Small puzzles released multiple times a week
Full-Sized Crossword
Classic NYT-style puzzles released intermittently
Stanfordle
Special Editions
Magazine
Archive
Sponsored Content
Polls
