When i was at school, i spent two summers at my grandfather’s. they were the holidays i’ve ever had. grandpa lived alone in a country cottage near a small river. grandpa’s hobby was making birdhouses. he always said that he a hobby to fill his free time. grandpa’s workshop was full of all kinds of tools. there a big table, hammers, nails, paints, and what not. and all the tools carefully in their places. that was grandpa’s number one rule. the rule was, “never buy a new tool if the old one still works.” in the workshop, when he the birdhouses, i asked him lots of questions about birds. he a lot about them! he could tell one bird from another by their songs and footprints. i was surprised that grandpa / the birdhouses in bright colours. he explained to that birds prefer natural colours that make their houses more difficult to notice and, for that reason, safer.