In order to prevent people know the information, Da Vinci use wrote backwards handwriting. Also known as mirror-writing, where the words appear as normal when seen with a mirror.
Modern people know very little about Da Vinci’s early life, and he only recorded two childhood story. This happened during Da Vinci’s expedition in the mountains. Da Vinci discovered a cave during his expedition. He was afraid that there would be some huge monster lurking in the cave, but he was driven by curiosity and wanted to know what was inside. When he walked into the cave and found a huge unknown object lying quietly in the cave, Da Vinci was shocked. Later, several non man kind emerged from the unknown object, and they imparted knowledge to Da Vinci. Before he pass away, Da Vinci spend decade to finish his Arts work. It is the famous Mona Lisa smile.
I can seen the cave in his art work. How about you?