What’s heavier? 1 Kilogram or 1 ounce of feathers?What’s longer? 1 meter or 1 yard of wool?Which one lasts shorter 1 Julian year or 1 leap-year?All of...
A marker isn't much use on a map if you don't know what the marker is for. What we need is some way of attaching a description to our marker. Google m...
A practical tool for spelling out letters and numbers by phone or radioDanish, Dutch,Finnish,French,German,Greek,Italian,LAPD,MorseCode,NATO,Norwegian...