编辑点评：张鹏点评：Wolfram Alpha 是Siri 背后的技术支持，你几乎能在WA 是搜索任何东西，哪怕是一条方程的解。

Remember the Star Trek computer* It's finally happening--with Wolfram|Alpha. Building on 25 years of development led by Stephen Wolfram, Wolfram|Alpha has rapidly become the world's definitive source for instant expert knowledge and computation.

Across thousands of domains--with more continually added--Wolfram|Alpha uses its vast collection of algorithms and data to compute answers and generate reports for you.

Parts of Wolfram|Alpha are used in the Apple Siri Assistant; this app gives you access to the full power of the Wolfram|Alpha computational knowledge engine. Domains covered by Wolfram|Alpha include:

MATHEMATICS
Elementary Math
Numbers
Plotting
Algebra
Matrices
Calculus
Geometry
Trigonometry
Discrete Math
Number Theory
Applied Math
Logic Functions
Definitions

STATISTICS & DATA ANALYSIS
Descriptive Statistics
Regression
Statistical Distributions
Probability

PHYSICS
Mechanics
Electricity & Magnetism
Optics
Thermodynamics
Relativity
Nuclear Physics
Quantum Physics
Particle Physics
Statistical Physics
Astrophysics
Physical Constants

CHEMISTRY
Elements
Compounds
Ions
Quantities
Solutions
Reactions
Chemical Thermodynamics
Protecting Groups

MATERIALS
Alloys
Minerals
Crystallography
Plastics
Woods
Bulk Materials

ENGINEERING
Acoustics
Aeronautics
Electric Circuits
Fluid Mechanics
Steam Tables
Psychrometrics
Refrigeration
Structures

ASTRONOMY
Star Charts
Astronomical Events
Planets
Moons
Minor Planets
Comets
Space Weather
Stars
Pulsars
Galaxies
Star Clusters
Nebulae
Astrophysics

EARTH SCIENCE
Geology
Geochronology
Geodesy
Earthquakes
Tide Data
Atmosphere
Climate

LIFE SCIENCES
Animals & Plants
Dinosaurs
DNA Sequence Lookup
SNPs
Proteins
Human, Mouse & Fruit Fly Genomes
Metabolic Pathways

COMPUTATIONAL SCIENCES
Cellular Automata
Substitution Systems
Turing Machines
Computational Complexity
Algebraic Codes
Fractals
Mathematica
Image Processing

UNITS & MEASURES
Conversions
Comparisons
Dimensional Analysis
Industrial Measures
Batteries
Bulk Materials
Paint

DATES & TIMES
Date Computations
Time Zones
Calendars
Holidays
Geological Time

WEATHER
Current & Historical Weather
Forecasts
Wind Chill
Hurricanes
Clouds
Climate

PLACES & GEOGRAPHY
Maps
Projections
Geodesy
Navigation
Distances
Geomagnetism
Geocoding
Countries
Cities
Elevation Data
Oceans
Lakes
Rivers
Islands
Mountains

PEOPLE & HISTORY
People
Genealogy
Names
Occupations
Political Leaders
Historical Events, Periods & Countries
Historical Numerals & Money

CULTURE & MEDIA
Books
Periodicals
Movies
Video Games
Fictional Characters
Mythology
Television Networks & Programs
Awards

MUSIC
Musical Notes
Intervals
Chords
Scales
Audio Waveforms
Instruments
Songs

WORDS & LINGUISTICS
Word Properties
Dictionary Lookup
Word Puzzles
Anagrams
Languages
Document Length
Morse Code
Soundex
Number Names

SPORTS & GAMES
Football
Baseball
Olympics
Stadiums
Lotteries
Card Games

COLORS
Color Names & Systems
Color Addition
Temperatures
Wavelengths

MONEY & FINANCE
Stock Data
Indices
Mutual Funds
Futures
Mortgages
Present Value
Currency Conversion
Tips
Bonds
Derivatives Valuation
Wages
Sales Tax

SOCIOECONOMIC DATA
Demographics
Countries
US States
US Counties
Cities
Economics
Agriculture
Energy
Salaries
Unemployment
Cost of Living
Health Care
Housing
Social Statistics
Crime
Military
Religion

HEALTH & MEDICINE
Body Measurements
Growth Charts
Exercise
Diseases
Mortality Data
Medical Test Data
Teeth
Vision
Drug Data
Hospitals

FOOD & NUTRITION
Foods
Dietary
References

EDUCATION
International Education
Universities
School Districts
Public Schools
Standardized Tests

ORGANIZATIONS
Companies
Hospitals
Foundations
International Organizations

TRANSPORTATION
Airports
Airlines
Aircraft
Flight Data
Road Transport
Gasoline Prices
Bridges
Tunnels
Tides

TECHNOLOGICAL WORLD
Communications
Satellites
Space Probes
Photography
Barcodes

WEB & COMPUTER SYSTEMS
Website Data
IP Lookup
Notable Computers
Data Transfer
Port Numbering
String Processing
Hashing
Unicode Lookup