  This is the final and somewhat expanded version. The quality of the color
photos of this version is poor as there is an upload limit on astro-ph. Much
higher quality versions are available at http://space.mit.edu/~lewin/jvp.html .
A bound hard copy with very high-resolution color photographs will be sent to
you at request. Please send e-mail with your complete mailing address to
<EMAIL_ADDRESS>