the best science on the web about
ultrasound & infrasound

Ultrasound
Image: iStockphoto.com/amoklv

Ultrasound

Our ears hear nothing of the high-pitched sounds that let bats and dolphins "see" in darkness, or the low-pitched ones that let whales call out across whole oceans.

Fortunately, we have machines that let us make use of both super-high ultrasound and super-low infrasound so parents can see their unborn babies and governments can detect nuclear explosions. You'll find lots more here.

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Sound, Ultrasound, and Seismic Waves

Sound, Ultrasound, and Seismic Waves

How do sound waves form, how do they differ from one another, and how can they be put to use? This site sums up sound. More...

Article
BBC
Advanced Ultrasound for the Space Program and on Earth

Advanced Ultrasound for the Space Program and on Earth

Using ultrasound, even people who aren't medical professionals can diagnose illnesses and injuries. This may save lives in space and also in remote locations on Earth. More...

Article
NASA
Baleen Whales Infrasound

Baleen Whales Infrasound

Have your parents told you to turn down your music? Well, they're lucky you're not a fin whale. If you were, your infrasound songs could be heard thousands of miles away! More...

Article
Animal Communication Project
Breast Cyst Ultrasound

Breast Cyst Ultrasound

Finding a breast lump is scary, but an ultrasound may quickly show that it's harmless and even allow a doctor to remove it on the spot. More...

Video
The Doctors
Echolocation and Ultrasound

Echolocation and Ultrasound

Scroll down this web page to meet animals that use ultrasound for communication and navigation. More...

Images
BBC
How Ultrasound Works

How Ultrasound Works

This site goes deep into how medical ultrasound technology works and what it can reveal about peoples' insides. More...

Article
HowStuffWorks
Infrasonic Calls and How They Work

Infrasonic Calls and How They Work

Sound waves too long for us to hear travel farther than shorter sound waves. That's why elephants can hear other elephants from at least 2.5 miles (4 km) away. More...

Article
Animal Communication Project
Infrasound Takes a Bow

Infrasound Takes a Bow

An infrasound detector in Antarctica heard a meteor explode over Russia, thousands of miles away. More...

Article
QUEST
Sound Waves Used to Increase Disk Drive Capacity

Sound Waves Used to Increase Disk Drive Capacity

Thanks to ultrasound, both hard disk drives and solid state drives may soon be storing more data than ever. More...

Article
Computerworld
Types of Ultrasounds

Types of Ultrasounds

Taking pictures of fetuses is great, but ultrasound has many more medical uses, as this site explains. More...

Article
WebMD
Watch the Baby Grow! Ultrasounds Week by Week During Pregnancy

Watch the Baby Grow! Ultrasounds Week by Week During Pregnancy

You may not believe the detail that advanced ultrasound machines can reveal, when they look inside the womb. More...

Video
YDBbook

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