THE VOYAGER MESSAGELIFE ON EUROPA?SCANNING THE SKYPRIMITIVE LIFELOOKING FOR SIGNALSEXTRASOLAR PLANETSTHE DRAKE EQUATIONFIND OUT MOREEarth is the only world we know of that supports life. But is…
METAL GROUPSGOLD IN QUARTZEXTRACTING GOLDMETALLIC PROPERTIESALLOYSFIND OUT MOREAlmost three-quarters of all elements are metals, such as gold and silver. There are also some elements we may not…
FERTILIZATIONWIND DISPERSALCROSS FERTILIZATIONPOLLENPOLLINATORSFIND OUT MOREThe male sex cells of seed plants (flowering plants, conifers, and cycads) are contained in tough capsules called…
AIR PRESSUREWATER PRESSUREFIND OUT MOREWhen you press or push something, the force you apply is called pressure. Pressure is measured as the force you use divided by the area over which you use…
INSIDE A SEEDSPREADING WITHOUT SEEDSGERMINATION OF A RUNNER BEANFRUITSFIND OUT MOREMost plants grow from seeds. These seed plants fall into two groups, angiosperms and gymnosperms. Angiosperms…
WOODY TISSUEFORESTSEVERGREEN TREESDECIDUOUS TREESFIND OUT MOREThese tall, seed-producing plants live for many years and do not die in winter. Trees have a single woody stem, called a trunk,…
Spy Times Some notable American turncoats by Gerry Brown and Beth Rowen Ethel Rosenberg, 35, and her husband, Julius, 34, ride to separate jails in on New York City March 29, 1951…
Anatomy of the HeartAnatomy and PhysiologyThe HeartAnatomy of the HeartThe Four ChambersThe Heart's Own BloodECG: Measuring a Beat The four-chambered heart is the result of millions of years of…
Lungs, Bronchi, Trachea, Nose
Anatomy and Physiology
The Respitory System Lungs, Bronchi, Trachea, Nose Pharynx More Than Just a Pipe Gas Laws and Breathing Volumes and Volumes
I know, I…
On June 19th, 1865, Major General Gordon Granger led a band of troops to Galveston, Texas, to proclaim slavery abolished. It had been two months since the surrender of Robert E. Lee and the…
