CASTING A LINE ‘#8216;Can you remember?’#8217; It starts with a question from my 7-year-old son. We are in the grounds of our rented cottage in the Baixa Alentejo, killing time before we head to the Algarve coast for a boat trip. With his holiday money, Isaac has bought himself a hand-held toy that fires little foam rockets prodigious distances up into the air, and he has lost one of them on the grav