they know they cannot make any improvement in life, that it is impossible to be any better at all.

How would the previous sentence be correctly capitalized?
Answer: They know they cannot make any improvement in life, that it is impossible to be any better at all.
on saturday we can expect fair weather. morning temperatures will be around 23 °c. during the day they will reach a maximum of 28 °c. low temperatures at night will be around 22°c. westerly winds increase and are brisk with strong gusts in the afternoon.

How would the previous sentence be correctly capitalized?
Answer: On Saturday we can expect fair weather. Morning temperatures will be around 23 °C. During the day they will reach a maximum of 28 °C. Low temperatures at night will be around 22°C. Westerly winds increase and are brisk with strong gusts in the afternoon.
late september or early october 1534: escape from the mariames by cabeza de vaca and dorantes and escape from iguases by estebanico and castillo.

How would the previous sentence be correctly capitalized?
Answer: Late September or early October 1534: Escape from the Mariames by Cabeza de Vaca and Dorantes and escape from Iguases by Estebanico and Castillo.
curcumin may help stimulate foxp3+ treg production in the bowel, june 2017 newsletter, p. 14-15

How would the previous sentence be correctly capitalized?
Answer: Curcumin may help stimulate FOXP3+ Treg production in the bowel, June 2017 Newsletter, p. 14-15