Excerpt taken from halos.com/index.htm:

"Etched within Earth's foundation rocks — the granites — are beautiful microspheres of coloration, halos, produced by the radioactive decay of primordial polonium, which is known to have only a fleeting existence.

The following simple analogy will show how these polonium microspheres — or halos — contradict the evolutionary belief that granites formed as hot magma slowly cooled over millions of years. To the contrary, this analogy demonstrates how these halos provide unambiguous evidence of both an almost instantaneous creation of granites and the young age of the earth.

A speck of polonium in molten rock can be compared to an Alka-Seltzer dropped into a glass of water. The beginning of effervescence is equated to the moment that polonium atoms began to emit radiactive particles. In molten rock the traces of those radioactive particles would disappear as quickly as the Alka-Seltzer bubbles in water. But if the water were instantly frozen, the bubbles would be preserved. Likewise, polonium halos could have formed only if the rapidly "effervescing" specks of polonium had been instantly encased in solid rock.

An exceedingly large number of polonium halos are embedded in granites around the world. Just as frozen Alka-Seltzer bubbles would be clear evidence of the quick-freezing of the water, so are these many polonium halos undeniable evidence that a sea of primordial matter quickly "froze" into solid granite. The occurrence of these polonium halos, then, distinctly implies that our earth was formed in a very short time, in complete harmony with the biblical record of creation..."

"...Every question regarding the validity or implications of this polonium-halo evidence has been systematically dealt with, in our published reports and in various discussions with those holding differing views. We invite you to peruse the points we have raised in our exchanges, consider them, and decide for yourself the truth of the matter.

Of particular interest will be our recent discussion with the Institute for Creation Research (ICR) regarding the validity of our work.

In the Exchanges section of our website we've posted our letter to Dr. K. R. Walker, requesting the references to successful granite synthesis experiments that UT's Dr. Larry Taylor had referred to. We also have posted two letters from Dr. Brent Dalrymple that refer to the unrefuted Polonium evidence for the creation of granite..."