Where is the best known Mappa Mundi housed?
Hereford Cathedral in England.
What other attraction is there in the same location?
The chained library.
What percentage decrease in mortality results from regular screening in clients above 50?
What percentage of cancers found in large screening series will be DCIS?
There is the "Mappa Mundi" of DCIS - the calcifications are "wild and crazy", there are X's, Y's and Z's visible haphazardly distributed on a segment of the breast. Look carefully at the distribution; you can see the calcifications in a ductal distribution as the DCIS grows out of blood supply and calcifies in response.