It is Yom HaShoah: Holocaust Remembrance Day. This is the time we remember the 11 million people (including he 5 million non-Jews too often left out of our remembrance) who were killed by the Nazis in WW II.

Written in Pencil in the Sealed Freight Car

Here, in this freight car,
I, Eve,
with my son Abel.
If you see my older boy,
Cain, the son of Adam,
tell him that I...

--Dan Pagis, as quoted in Ariel Hirschfeld's chapter in Cultures of the Jews, David Biale (ed.)