With the weekend in sight, CTVNews.ca has five things you need to know: A U.K judge blames Russia for the murder of an ex-spy; a pregnant Quebec woman says she was forced to walk home after police seized her car; Prime Minister Justin Trudeau is meeting more CEOs in Davos; without changes, plastics will outweigh fish in the ocean by 2050, according to a new report; and scientists believe there is a new planet hiding in our solar system.

And for "Lifehack Thursday," tips on how to keep your home spotless.

1) Blame game: A British judge says that Russian President Vladimir Putin "probably approved" a plan to kill former agent Alexander Litvinenko. Litvinenko was poisoned with polonium-210 at a London hotel in 2006.

2) Take a hike: A pregnant Quebec woman says she was forced to walk home in freezing temperatures after police confiscated her car. Laura Cerminara, a Grade 10 teacher, says she is considering filing an official complaint.

3) WEF highlights: CTV News has the highlights from the World Economic Forum in Davos, Switzerland. Prime Minister Justin Trudeau used his keynote address to attempt to differentiate him from Stephen Harper, saying that his "predecessor wanted you to know Canada for its resources," but he wants it to be known for "resourcefulness." Hollywood actors Leonardo DiCaprio, Kevin Spacey, and musician Will.I.Am were also in attendance.

4) Plenty of plastic: A report released by the World Economic Forum predicts that, if current plastic production and waste remain the same, there will be more plastic than fish in the world's oceans by 2050. The study says that currently about one garbage truck-sized load of plastics is dumped into the oceans each minute.

5) The truth is out there: Scientists believe there may be a ninth planet in our solar system. Thought to be as big as Neptune, it's believed to be so far away it would take 10,000 to 20,000 years to circle the sun.

And one more thing for "Lifehack Thursday": There are times when the task of tidying up and decluttering your home can seem monumental. Surrounded by piles of clothes, bills, books and CDs, it's easy to get overwhelmed. But a popular tidiness guru has a tip she says can make the task infinitely easier: Pick up an item and simply ask yourself, 'Does this bring me joy?'

Marie Kondo