India, April 23 -- Christel Krueger peered through thick glass and murky water at the Berlin Zoo, staring in awe at a mother hippopotamus and her child sleeping on a sandbar. Krueger, 86, and her daughter were on a specialised zoo tour last month for people who live with dementia that was organised by Malteser Deutschland, part of the international Catholic aid organisation Malteser Order of Malta. On the tour with Krueger, Ingrid Barkow watched from her wheelchair as the elephants roamed their habitat, while Monika Jansen balanced on her tiptoes to get a better view of a rhinoceros. "When I get home, I'll still be thinking about it," said Jansen, 85. "Maybe even at night, while I'm sleeping and dreaming about it." The three women are amo...