Last night was cold. All heaters did not work for unknown reasons.
Finally before we slept, the lower floor heating works by some random
tweaks and so was the water heating.

This morning we woke up later than yesterday. Perhaps we need more
sleep in general. The radio telescope continued to send data that
correlates to the rise of Jupiter and the Sun. We expected Don to come
in the afternoon, but soon we heard some mysterious knocking sound and
see Don arrived. We were tricked by a really bad April Fool's joke and
discussed what to do, until we realized that. The engineers received
help from Don to troubleshoot the second floor heater, and successfully
tested 2 backup generators. Guerric, Elanz and I went to the
observatory to replace the string for closing the roof using heat
shrink tubes and tapes.

After lunch, 2 EVAs were planned. EVA 1 saw the commander first set
foot on Mars, with the words "That's one small step for a man, one
giant leap for mankind." Guerric followed and we went to the
engineering area to select a light but stiff bar to reinforce an
airplane wing, all the way communicating on radio or speaking directly at
close range (Mars has thin air - perhaps shouting is needed). The radio
made the conversation harder to hear, too loud, and sometimes producing
annoying sounds. The radio button was harder to reach than imagined by
gloves. We returned to help Violette and Elnaz in EVA 2 with their
ATVs. They traveled far with GPS recording to test the radio range from
the Hab, with Jan extending out of the Hab from the roof in an imagined
pressurized space. This enhanced the radio range by orders of
magnitudes. If the roof antenna could be connected, this would not be
needed. EVA 2 experienced the fading of radio performance when they
went far enough. We returned a bit hot and sweaty. Another
observation is, with some skills, it seems that one can don the EVA
suit alone when needed.

The toilet, as usual, did not flush again. Guerric and I went to the
GreenHab to jiggle the sensor. Not sure
when this trouble and other water pumping can work automatically. We
were also unsure when we saw little flow going through the pump to cool
it from burning out.

The heating for the upper floor has yet to be fixed. It will require
some out of simulation troubleshooting outside the Hab tomorrow.

At least and at last, we have set foot on Mars today, on April Fool's
Day.