Why is our oak tree shedding so much sap ?

Sticky sap is dropping from our oak tree and it is turning the deck black. It can be washed off but within days it is covered again. Is this something I can prevent?

What is a VPN?

VPN is (Virtual Private Network) were first used by companies to enable their employees to securely access internal systems such as email remotely (e.g. from home or while on business trips). Today they are increasingly being used for personal use by individuals to protect their privacy while online in public places (e.g. when using the wi-fi connection in a cafe) or in a country where the internet is censored / blocked (e.g. China, Saudi Arabia…).